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Fluctuation conductivity in a superconducting proximity sandwich

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Abstract

The fluctuation conductivity above the transition temperatureT c is calculated in a superconducting proximity sandwich containing magnetic impurities. The calculations are carried out in the framework of the Kaiser-Zuckermann theory based on the McMillan tunneling model, under the condition τS,N T c≪1, where τS,N are the lifetimes of electrons associated with the tunneling process. The role of the proximity effect is to suppress the fluctuation conductivity by renormalizing the coefficients of the Aslamazov-Larkin and Maki-Thompson terms, and the third term. On the other hand, magnetic impurities affect mostly the Maki-Thompson contribution via the pair-breaking parameter, which is derived as a quantity depending on τS,N, the spin-flip lifetime, and temperature.

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Financial support provided by the Post-Doctoral Fellowship Commission in Science and Engineering Research Laboratory, Waseda University.

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Mori, N. Fluctuation conductivity in a superconducting proximity sandwich. J Low Temp Phys 46, 543–553 (1982). https://doi.org/10.1007/BF00683916

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Keywords

  • Magnetic Material
  • Proximity Effect
  • Magnetic Impurity
  • Tunneling Process
  • Tunneling Model